DialogFragment not displaying message

Question

I have a class that looks like this:

public class MyDialogFragment extends DialogFragment implements DialogInterface.OnClickListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        super.onCreateDialog(savedInstanceState);

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());

        alertDialogBuilder.setTitle("This is a title");
        alertDialogBuilder.setMessage("This is a message");
        alertDialogBuilder.setPositiveButton("Yes", this);
        alertDialogBuilder.setNegativeButton("No", null);

        return alertDialogBuilder.create();
    }

    @Override
    public void onClick(DialogInterface dialogInterface, int i) {
        // Do something
    }

    public void showAllowingStateLoss(FragmentManager fragmentManager) {
        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.add(this, "MyDialogFragment");
        ft.commitAllowingStateLoss();
    }
}

And it is used like this:

MyDialogFragment dialog = new MyDialogFragment();
dialog.showAllowingStateLoss(fragmentManager);

The problem is that the message isn't shown in the app, it just displays this:

What am I doing wrong?

Answer 1

I found the solution myself. Apparently the dialog use android:textColorPrimary from the theme as the text-color, and that color is white in my app. That results in an alertdialog that contains white text on a white background.

The solution was thus to add this in theme.xml:

<style name="MyAndroidTheme" parent="Theme.AppCompat.Light">
    <item name="android:alertDialogTheme">@style/MyAlertDialogTheme</item>
</style>

<style name="MyAlertDialogTheme" parent="MyAndroidTheme">
    <item name="android:textColorPrimary">@android:color/black</item>
    <item name="android:windowBackground">@android:color/white</item>
    <item name="android:windowIsFloating">true</item>
</style>

I don't really know why android:windowIsFloating is needed, but without it, the dialog becomes fullscreen.